Hydraulic door check



Aug. 3, 1943. D. J. sEAMAN HYDRAULIC DooR'cHEcx Filed Aug. 2, 1940 www I *i* i C me@ Y xturned to its former state.

`.A` further object of the'invention doux-.11,11

i Patented Aug. i3, ,A l. I f

` "HYDRAULIC Doonmcinzclr c o Y `pavia asesinan, Battle creek, when..`

Apiliidatibnlaugustiz, 194'o,ser1a1No. 349,408 f o o proclaims. (c1. 11s-54)` Y The presentinvention relates to hydraulic door checks :and more particularly `to a, door check` particularly adapted to befdisposed within a door pivoted from the top and bottomthereofl having Yabout the axis of rotation apost of arcuate -crosssection of the ,character disclosed in my `Patent No. 2,184,259.' l o l y i Door checks and closers of the character employing` cams and springsv in` association with the movement of a hydraulic iluid `:havebeen used heretofore but have not been satisfactory for'the reason that the servicing of them has `beendiiiicult and frequently required `an adjustment,

l frequent service requirements` andal vdoor `check which may be adjusted readily-,byanyone as the `conditions require. The desirability of,` having. a`

hydraulic check readily adjustable will be under# stood `when itlis realized ,that hydraulic checks are-generally employed in public buildings,` such as stores, for instance, and it is desirable to have the tension ofthe checks set so that the door vwill properly close but `will notrequiretoo much eort to move it open. `However,when a door is set with such a minimum tension, the tension is not sufficient to prevent the door from beingv blown open by` a strong wind in the streeti.,Such arr1 undesired opening, not only permits the blowing l I `which adjustment required a skilled mechanic. According -to the present invention, a hydraulic door check has beenprovided which is `rugged and of few parts, thereby not being subject to o A stm further object pf the invention `is to i provide a hydraulic check having two chambers,

the effective volumetric` capacity of whichv is changed during the opening and closing or `the door requiring a flow-` of hydraulic iiuid from one ofthe chambersvto the other to control the Vspeedoi opening and closing, wherein one of the `chambers kcomprises a` reservoir draulic fluid.

1 These and other lobjects will be. apparent from the followingspecificatfion when taken with the accompanying drawing in'which; e

Figli s;a,verticalsectionof aportion of a doorincluding the check according to the present invention, 1 l l Fig-.21S` selection; OrlA the @inail-1110i `Fig- 1,

of dust and'dirt into the building, but alsomakes t the t front portion ofV a store, for instance, most uncomfortablevforl sales persons. `According.to

the presentinvention, the `check maybe readily 1 adjusted 4in a few momentsto increase-thetension` to take` care of the added tension jrequirementsdue to the outside wind and when the wind d has abated, theradiustment maybe readily re-fV `An object of the inventionis ldrauliccheck'for doors, the tension of which may to provide a Fig. `311s a section en, theliiii 11r;1`r1`0f F154. Referring,particularlyto the drawing,l thereferencefchar'acter Iindicat'esla door pivotally supported-in a `frame 2 by means of` an upper pin 3 and a lower pin not shown. `Concentric with thef axis ofthe lpiniis a post-@,*tubularinformrand 4disclosed more particularly in my aforesaid patent where a method'of securing the door I and the post 4 together is also shown. o

The` pin 3is supported vfrom the frameZ by means of a support 5 disclosedmore particularly and claimedlrinmy; co-pending application, Sel ,rial No. 349,497-, iiledAug. 2, 1940. The support 5 comprises a cylindrical memberj havingthere-` ini asquared opening 1 for receiving the squared upper end 8 of the pin 3. f The cylindrical member 6 is telescopically movable `in a cylindrical .member 9. Downward movement of the member `I5 is limited by a `shoulder III thereon engaging with `a shoulder II` of the'member 9. Rotary -movement ofthe'member Ii` with respect to .the

member 9' is prevented by means of aiset screw o. The check, according4 `tofthe presentinvention,

. is 'housedin acylinder I5, having end caps IB be adjusted ina few moments-by anyone. y

VAnother object 'of ,the invention` is tofprovide 4a `hydraulic check hou'sedin a unit which maybe readily insertedlin 'a `door; and removed therefrom l `for thepurpose of servicing.` t, v-.d .d

l is to A,provide and Il. `The cylinder I5 withitscapsissecured j `in some suitable manner in theV post 4.` The 'up-Y per `end of the pin 3` is supported` in thel cap I6 by a bearing I8 andthe leakage of hydraulic fluid `from withinftlie `checlgfpastthe piri,` is preventedrby an oilpseal I9 ofsome suitable'form.`

a hydraulic check associated with the pivoting pinot the door, theipivotingy pin being"enrlployedyf` to support moving; partsfor sliding movement and* to `conduct through suitablelportsj therein duringgopening and closing movement oLthe The lower or-inner, end ofthe `pin 43 is sup,- `ported `in a vbore 20 inthe. cap IT.

On `the upper surface of' thecap `I1 provideda-cam 2| lfor hydraulic `fluid from `onecha.mbertoarityther acting against a follower 22` which consists of a Y vpiston 23-having depending ears` `24 on which are 1 mounted rollers: 25. The cam 2 I is `cylindrical inform with dlametrically opposed `parts theresquared openingl. With thisconstruction, the

4 by the square projection 60.

pin to adjust the tensionof saidspring.

`cylinder' l5 `togetherlwith its check enclosed is r maintained in the post I by gravityand is mainy tained against rotation` with respect to'lthepost"` t tuA Having lthus described my invention, what:

4 desire to secure by Letters Patent and 'claimisz 1. A `door check for controlling the maniementV of a door in a frame comprising a cylinder adapted i Y spring in `said-cy1inder havingyone end supported to be supported bysaid door, a. pivotpin for said door adapted to be fixed with respectto said; xi frame and projecting into said cylinder,`a capf for one end of said cylinder, said cap supporting i said pin, a camin said cylinder andfsupported by, y

said cap, afollower in saidcylinder, slidable: on

i said pin and beingsplined thereto, a spring `in `1 said cylinder having one end `supported `with respect to said door. urging said follower intoensaid follower axially of said pininisaid cylinder V20 n gagement with saidlcam, a piston comprising a portion: of said follower dividing said cylinder 4. A door check for controlling the movement of adoor in a frame comprising a cylinder. adapte ed to `be supported by said door, a pvot pin for sani` door adtptedto be nxed with respectfto saidV frame and projecting intorsaid cylinderp-a i cap for oneend of said cylinder, said cap supportingy said pin, fa cam in said cylinder'andV f supported by saidcap,a follower in said` cylinder,

sutiable onsaid pin and `teint; spnned thereto, a

withrespectl to said door, urgingsaid followerf into engagement` with said cam, a piston comprising a portionl of said follower dividing Asaid cylinder into two chambers, "one housingl`the spring and the otherrhousing said cam and follower, said canibeing activeupOn-'opening oi? the i door to` `move` saidfollower axially of saidpin in said cylinder against the action of said spring, 1 `said spring uponremovalof the opening force being active to force said follower against said against the action of said spring, said spring upon removal of the opening force being -activeto -force said follower against, said cam to close the door, ,i

i 1 'sihydraunc' nuid in said chambers, and port means for controlling theflow of Viuid between said chambers during opening and closing movement ofrsaldv door to control the rate `of `opening Y and closing thereof. i 1. 2. `A door checkffor controlling movement cfa y door in a frame, comprising acylinderfadapted to be supported by said v(loon-e, pivot pin for saidV cam toclose the door, a hydraulic'iuid in` said chambers, and ,port means for 4controlling theljf flow of iiuid4 between said cham-bers'duringopeni ing `and closing movementof said door to con-` trol the rate vof openingand closing thereof,` said port means comprising a cavity in said cap beneath said pin, a port in saidpin extendingaxially `thereof providing a communication between'` said springhousing chamber and said cavity, a'port' between said lcam and follower housing chamber door adapted to be iixed withrespect to said frame and projecting into said cylinder, meansV 1' slimiiorted,with` respect to said cylinder for sup-v porting the inner end `of saidpin, aicain'within saidcylinder and supported withl respect, thereto, a helical` spring in said cylinder substantially concentric with said pin, aiollower in said cylinr der between said spring and said cam, said spring urging said follower against saidcam. and an and said cavity, means restricting said last named i portpand a Yby-pass check vvalve providing communication between said last named port `and said .cavity for permitting the flower hydraulic "fluid therethrough from said cavity butnot into Saidcallity.: v Y f "5.1The invention as defined in claim 3J wherein i saidY cylinder is provided with lanopening opposite saidabutment for exposing said abutment `pto permit adjustment thereof fromwithoutsaid if cylinder.

abutment supported `in `said cylinder for 'receiv- Y ingfthe thrust of saidspringand formovemerit of said spring, said abutment being adf justableforladjusting the tension of the spring.

6. A door `checkl for controlling movement of a docrin a fraandxcomprislng a cylinder adapted i to` besllpp'orted by said door,'a pivotpin `for said j y `dooriadapted-to be fixed with respect to said frame i and projecting into `said cylinder, meanswithin 3; A door `check for controlling `*movement of adoor, in a frame, comprisingra cylinder adapted `to be supported by said door, aipivotipin for i saidfdoor `adapted to` be iixed` `with `respect, to;

said frameA and projecting into,` said cylinder,

j means supported with respect to saidcylinder for supporting the inner end of said pin, a cam within said cylinder substantial1yl-v concentric *with said'A L pin, `o. follower" in said: cylinderl between said springand `said cain,` saidsprin'g, urging said i follower against said cam, an abutment threadably connected to said pin for opposing the thrust of said spring, andmeans to rotate saidabutment said cylinder for supporting the inner end .ofsaid pin, a cam within said cylinder and supported with Irespectfthereto, a` helical spring in said l cylinder, i a Y follower inV said ,cylinder` operatively ,between said springfand said cam,v said spring i i urging said follower against said cam, adrivingjconnection betweenfsaid follower and 'said` w pin for moving said door with respect `to said pin, andan abutment supported in said cylinder` I y for receiving the thrust of said spring `a'ndfforjy `movement axially'of` saidV spring, said abutment being"` adjustable for adjusting the tensioniof*` saidsprlng. i, j f 

